On Fri, Jul 06, 2018 at 01:22:57PM -0500, David Lechner wrote: >On 07/06/2018 12:21 PM, Jonathan Cameron wrote: >> On Mon, 2 Jul 2018 22:48:35 -0400 >> William Breathitt Gray <vilhelm.gray@xxxxxxxxx> wrote: >>> Is frequency useful for other >>> applications on its own (perhaps velocity of an automobile device >>> equipped with an encoder wheel for some reason or other)? > >Since we are just dealing with counters here, I think we should call >it "rate" instead of "frequency". At least that seems to be the common >name in industrial automation. > >Another possible use case for "rate" would be flow meters. Some >flow meters generate a pulse every X gallons. Assuming that the >counter also has a rate output, then you can scale the rate (e.g. >counts/second) into flow in gallons per minute. > >>> >>> Once we figure out how this data is used, we can determine the best >>> design and place to introduce it into the Generic Counter interface, >>> then move on to integration from there. >> >> Great - as long as this fits reasonably well in ABI wise (whatever the >> details) sounds like we don't need to solve it today. I'm anxious not >> to delay merging this counter subsystem for another cycle. > >Certainly don't delay things on account of me. I'm just trying to get >a feel for where things are headed since I missed the earlier discussions. >I don't see any major problems with the current state of things. > >Once this lands, I may have a go at the eQEP and see how it looks. No worries, it looks like your application would be served well by the Generic Counter interface, and exposing a "rate" value would be a simple feature to add. However, since this patchset has been stabilizing over the past few revisions, I want to postpone the addition of new features until this interface and its current feature set is merged. David, once this introduction patchset has been merged, submit to me a patch adding the "rate" functionality feature and we'll continue discussing it there. William Breathitt Gray -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
